Our Rotti did the same thing, nothing seemed to work
untill someone told me to change her food to Pro Plan.
I'm not sure what was in that food, but it took it away.
All her fur was coming back in a month, by three months
you would have never known she had any problems.
After all the steroid & different shampoos, it ended up
being her food.
Her vet was amazed!!!
Good luck!